a ha mh a haha
a ha mh a haha .
ä WORD_BOUNDARY x ä WORD_BOUNDARY m x WORD_BOUNDARY ä WORD_BOUNDARY x ä x ä WORD_BOUNDARY
a WORD_BOUNDARY h a WORD_BOUNDARY m h WORD_BOUNDARY a WORD_BOUNDARY h a h a WORD_BOUNDARY . WORD_BOUNDARY